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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea to have a spare key on hand regardless of whether you lost your keyfob or it stopped working. This article will provide everything you must be aware of adding, changing, or changing your Mazda 3 key fobs. Be aware that some keys require programming from a professional locksmith, while others don't. Make sure you only use genuine Mazda replacements for your key fob. How to add a spare key You can add an additional key in case you don't have a spare key, or if you accidentally break the one you already have. You'll need to use an flat-head screwdriver and an CR2025 battery. Once you've got all the equipment you need, it's time to open the key fob. Find the auxiliary key release. It's on the underside of the metal piece and is easy to locate. The cover on the back should fall off as soon as you press the button. Then, insert the screwdriver's head into the notch, or the spacing on the top of the metal part and then pull it off. Once the auxiliary key has been removed, insert the new or spare key into the slot. Switch the ignition on and then wait for around five seconds, then set it to off. This will allow the system to recognize the new key and start your vehicle in the future. You can only program three keys on your Mazda 3. The final thing you want is to have more than two working key fobs but not be capable of getting your vehicle started. This is a precautionary measure to stop unauthorised users from activating your keys and then starting your vehicle. How to Reprogram a spare key It's a smart idea to be aware of how to reprogram an extra key in the event that your original key is lost or stolen. This will keep unauthorised persons from starting your car, or taking it. This process is compatible with any Mazda however you'll need two working keys to start the reprogramming. If you don't own two working keys, you'll have to take your vehicle to the dealer to get it done. Start by getting into the driver's seat and close all the doors with the exception of the one that is open. Turn the ignition on and insert the initial working key. Take five seconds before removing the key. Repeat the process with the second key. Once you've completed programming your new key you should have 3 keys that will start your car in the future. Before saving each key, be sure that it's working correctly. It's a good idea to purchase an extra Mazda 3 key fob, especially if you're a driver who often loses your key or has other issues with it. You can purchase one online or at a local automotive store. Make sure to read reviews before purchasing so that you don't get one that's not compatible with your car. How do you change the battery on a spare key There's nothing worse than finding that the battery for your key fob has been damaged and you're unable to unlock your vehicle. Luckily, it's easy to replace the battery and save some money at the dealer. The first step is to press the auxiliary key button located on the back of the key fob. This will release the metal auxiliary key and expose slots on both sides of the case. Place the flathead in one of these slots, and gently pry the two halves of the case apart. Once the battery is fully exposed, take it out and place it in a safe place somewhere you won't forget it. Be mazda 3 keys to bring an extra battery in place prior to beginning. They can be bought at any store that sells batteries or from a Mazda dealer in Winter Garden. Using the right type of battery will ensure that your key fob works correctly. Replace the battery cap and then replace the battery. Be careful not to damage the small rubber ring that the battery is placed on. Press the two halves together until you hear a click. How do you reset the Keyless Entry System The key fob on your Mazda 3 is not only an extra convenience, but also an important security feature. The car will not start if the key is lost or stolen, even if you've got a spare key fob. The key fob must be reset by the dealer to enable it to function again. This could be a costly and stressful experience therefore it's a great idea to know how to reset the system yourself. To reset the system, remove the battery for about 15 minutes. This will erase any residual electrical power in the on-board computer. Then, disconnect the LF ECU and demand switch connectors. Then, check continuity between the following terminals: Insert the key into the slot, and turn on the ignition. The key should remain in the ignition for around five seconds, and then switch it off. The key's information has been added to the computer in your car and the new fob is able to start your vehicle. You can program any number of fobs you want, but only one should be used at a specific time. This stops unauthorized individuals from copying your key and getting ahold of your car. You can purchase a replacement keyfob from the internet, however it will still need to be programmed and cut by a dealer.